Hello,
You need 7 Uncommon keys to purchase one Rare key from Ana Bray. Do you have 7 uncommon keys?
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The only item that comes from the key chest at the end is armor. Weapons fall from the boss when it's killed. You can earn uncommon keys from Nightfall's after you complete the Warmind milestone. It takes 7 uncommon keys to buy 1 rare key, and then 7 complete levels of escalation protocol to make the rare key legendary to open the chest.